本文關鍵詞：新型電子式過載繼電器設計　出處：《天津大學》2014年碩士論文　論文類型：學位論文

  更多相關文章： 電子式過載繼電器 過載保護 負載不平衡 電磁兼容試驗

【摘要】：隨著科學技術的迅猛發(fā)展以及電器元件在各個領域應用的不斷深入,人們對在運行中電機的保護要求在不斷提高,特別是在現代化、自動化的行業(yè)中對電機的保護尤為重要,這就要求控制電機的電器元件具有多種保護功能,其中起過載保護的雙金屬片式過載繼電器準確性差,而電子式過載繼電器控制準確,為了滿足用戶對電子式過載繼電器控制準確性的要求,本文研制了一種控制準確、靈敏度高的新型電子式過載繼電器。本文研制的新型電子式過載繼電器是一種無需輔助電源的、同時具有手動復位和自動復位功能的電子式過載繼電器。此繼電器由動作機構、輔助觸頭、電流互感器、控制檢測單元和外殼等部分組成,采用數字采樣,單片機控制,具有電源指示、脫扣指示,測試按鈕,過載保護、斷相保護和負載不平衡保護等功能。通過對動作機構原理的介紹,本文提出一種利用電磁理論實現控制回路常開觸點和常閉觸點轉換的方法,以及如何運用異形扭簧實現手動復位和自動復位并存的方法;本文闡述了輔助觸頭系統(tǒng)設計中重要的兩個任務,即觸頭壓力計算和觸頭材料選擇;通過對控制檢測單元軟硬件設計的闡述,本文介紹了電子式過載繼電器中電源產生、信號采集、單片機信號處理以及如何使控制回路實現過載保護、斷相保護和自動復位等功能。本文闡述了電子式過載繼電器要通過國家強制性產品認證必須進行的幾個重要的型式試驗,包括輔助觸頭的接通和分斷能力、限制短路電流能力試驗、電磁兼容試驗以及動作特性試驗,分析了影響試驗結果的因素以及改進的方法。
[Abstract]:With the rapid development of science and technology and the application of electrical components in various fields, the requirements for the protection of the motor in operation are constantly raised, especially in the modernization. The protection of motor is particularly important in the automation industry, which requires that the electrical components controlling the motor have a variety of protection functions, among which the accuracy of the bimetallic overload relay with overload protection is poor. And the electronic overload relay control is accurate, in order to meet the user's requirements for the electronic overload relay control accuracy, this paper developed an accurate control. A new type of electronic overload relay with high sensitivity is developed in this paper. Electronic overload relay with manual reset and automatic reset. The relay is composed of action mechanism, auxiliary contact, current transformer, control detection unit and shell, etc. It adopts digital sampling. Single-chip microcomputer control, with power indication, tripping indication, test button, overload protection, phase break protection and load imbalance protection and other functions. Through the introduction of the principle of the action mechanism. In this paper, a method to realize the conversion between the normal open contact and the constant closed contact in the control loop by using electromagnetic theory, and the method of how to realize manual reset and automatic reset by using the special-shaped torsion spring are presented. This paper describes two important tasks in the design of auxiliary contact system, namely, the calculation of contact pressure and the selection of contact materials. Through the design of the hardware and software of the control and detection unit, this paper introduces the generation of power supply, signal acquisition, signal processing of single-chip microcomputer and how to realize overload protection in the control loop. This paper describes several important type tests for electronic overload relays to pass the national compulsory product certification, including the ability of connecting and breaking auxiliary contacts. The limited short circuit current capacity test, electromagnetic compatibility test and action characteristic test are analyzed. The factors influencing the test results and the improved method are analyzed.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM58

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